Isolation Monitoring
Definition
Continuous measurement of electrical resistance between high-voltage conductors and chassis ground to detect insulation faults before they become hazardous.
Why It Matters
- Detects insulation degradation before it causes shock hazard
- Required for high-voltage systems in many safety standards
- Prevents ground fault currents that can cause fires
- Provides early warning of moisture ingress or insulation damage
Common Pitfalls
- Not setting appropriate isolation resistance thresholds (typical: >100Ω/V)
- Ignoring Y-capacitor effects on isolation measurement
- Not considering altitude effects on isolation requirements
- Failing to test isolation monitoring functionality regularly